161213361 has 16 divisors (see below), whose sum is σ = 222351360. Its totient is φ = 103790160.

The previous prime is 161213317. The next prime is 161213389. The reversal of 161213361 is 163312161.

It is not a de Polignac number, because 161213361 - 2¹⁷ = 161082289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161213561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50820 + ... + 53898.

It is an arithmetic number, because the mean of its divisors is an integer number (13896960).

Almost surely, 2^161213361 is an apocalyptic number.

It is an amenable number.

161213361 is a deficient number, since it is larger than the sum of its proper divisors (61137999).

161213361 is a wasteful number, since it uses less digits than its factorization.

161213361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3676.

The product of its digits is 648, while the sum is 24.

The square root of 161213361 is about 12696.9823580251. The cubic root of 161213361 is about 544.2523890584.

The spelling of 161213361 in words is "one hundred sixty-one million, two hundred thirteen thousand, three hundred sixty-one".